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System and method for drx control and nack/ack

System and method for drx control and nack/ack description/claims

This application claims the benefit of U.S. Provisional Application Ser. No. 60/956,845 filed on Aug. 20, 2007, and U.S. Provisional Application Ser. No. 60/974,653 filed on Sep. 24, 2007 which are incorporated herein by reference in their entirety.

The application relates to wireless communication, and more particularly to transmission scheduling for wireless communication.

With semi-persistent scheduling, for downlink VoIP (voice over IP (Internet Protocol)) communications to a mobile device, a periodic DL (downlink) transmission resource is allocated during a talk-spurt on the downlink. The same resource is allocated each time. The allocation is turned on during each of the talk-spurts and off between talk-spurts. In this manner, explicit signalling to request an allocation, and to grant a particular VoIP allocation is not required. Semi-persistent scheduling for uplink VoIP communications from a mobile station is similar.

In addition to regular VoIP traffic, mobile devices also need the ability to send and transmit larger IP packets. Such larger IP packets are likely to be relatively infrequent compared to the frequency of regular VoIP transmissions. Such packets might include uncompressed IP packets, RTCP (Remote Transmit Power Control) packets, SIP/SDP (Session Initiation Protocol/Session Description Protocol) packets, etc. Such IP packets may be several hundreds of bytes in size and may have high priority. In addition, larger packets may be required to transmit RRC (Radio Resource Control) Signalling messages. Examples of this are handover related messages such as measurement reports. Some mobile devices will also need the ability to deliver a mixed service in which case services in addition to VoIP need to be provided to the mobile device, such as e-mail, web browsing etc.

Embodiments will now be described with reference to the attached drawings in which:

FIG. 1 is a signalling diagram showing dynamic scheduling vs. semi-persistent scheduling;

FIG. 2 is a block diagram of an example wireless system;

FIG. 3 is a signalling diagram showing an awake period for dynamic scheduling in DRX (discontinuous reception);

FIG. 4 is a signalling diagram showing DRX and DTX (discontinuous transmission) for uplink and downlink;

FIG. 5 is a state diagram having DRX and DTX transitions for VoIP;

FIGS. 6 and 7 are flowcharts of methods executed by a network to perform combined semi-persistent and dynamic scheduling;

FIG. 8 and 9 are flowcharts of methods executed by a mobile device to perform combined semi-persistent and dynamic scheduling;

FIG. 10 is a block diagram of a mobile device; and

FIGS. 11A to 14 are flowcharts of methods of discontinuous reception control to allow for ACK/NACK transmission.

• Provisional Patent
• Utility Patent

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